Recognised as Colour

#B5002F

#B5002F
Red
Dark
Nearest: Firebrick

#B5002F is a red with RGB values 181, 0, 47 and HSL 344°, 100%, 35%. It is a dark colour, so white text on it reaches 7:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#B5002F#B5002F

HEX#B5002F

RGBrgb(181, 0, 47)

RGB (0–1)0.7098, 0, 0.1843

RGB percentages71%, 0%, 18.4%

HSLhsl(344.4, 100%, 35.5%)

HSV / HSBhsv(344.4, 100%, 71%)

CMYK0%, 100%, 74%, 29%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,862,063

CSS custom property--colour: #B5002F;

Brightness & contrast

Relative luminance0.10029WCAG 2.x, 0 is black and 1 is white

Perceived brightness100.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.99:1

Contrast with white6.99:1WCAG normal text: AA

Contrast with black3.01:1WCAG normal text: Fail

Greyscale equivalent#2A2A2A

Inverted#4AFFD0

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#48432Fno red cones; affects about 1% of men; ΔE 67.1 from the original

Deuteranopia#706529no green cones; the most common form, about 1% of men; ΔE 67.1 from the original

Tritanopia#C8001Bno blue cones; rare, and affects men and women equally; ΔE 17.7 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text6.99:1WCAG large text: AAA

Contrast with black, large text3.01:1WCAG large text: AA

Named colours

Firebrick · ΔE 11.4 Crimson · ΔE 13.1 Brown · ΔE 13.4 Dark red · ΔE 19.9 Maroon · ΔE 21.5 Indian red · ΔE 24.7

Nearest named CSS colourFirebrick (#B22222)ΔE 11.38, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#00B586

Analogous#B5008A, #B52C00

Triadic#2FB500, #002FB5

Split complementary#00B52C, #008AB5

Tetradic#8AB500, #00B586, #2C00B5

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#FF82A2

Lighter +30%#FF4F7D

Lighter +20%#FF1C57

Lighter +10%#E8003C

Darker −10%#820022

Darker −20%#4F0015

Darker −30%#1C0007

Darker −40%#000000

More saturated +25%#B5002F

Less saturated −25%#9E173A

Channel breakdown

R181

B47

Red181 (71%)

Green0 (0%)

Blue47 (18.4%)

Hue344.42°

Saturation (HSL)100%

Lightness35.49%

Dominant channelRed

Hex per channelR B5 · G 00 · B 2F

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B5002F (chemical formula)

Formula
54,090.618 g/mol
5003 atoms

B5002F has a molar mass of 54,090.618 g/mol, made up of 5003 atoms across 2 elements: 5002 × B, 1 × F.

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Molar mass

Molar mass54,090.618 g/mol

Total atoms per molecule5003

Distinct elements2

Mass of one molecule8.9819584 × 10^-20 g

Molecules per gram1.1133429 × 10^19

Name

NameNot in the name tablea name cannot be worked out from a formula alone: isomers share formulas, and naming depends on bonding the formula does not show

Composition by mass

B100%

F0%

Boron (B × 5002)54,071.62 g/mol, 99.965%

Fluorine (F)18.998 g/mol, 0.035%

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